uncrustify.cfg: initial support for notmuch coding style

Uncrustify is a free (as in GPL2+) tool that indents and beautifies
C/C++ code. It is similar to GNU indent in functionality although
probably more configurable (in fairness, indent has better
documentation).  Uncrustify does not have the indent mis-feature of
needing to have every typedef'ed type defined in the
configuration (even standard types like size_t).

This configuration starts with the linux-kernel style from the
uncrustify config, disables aggressive re-indenting of structs,
and fine tunes the handling 'else' and braces.

In an ideal situation, running uncrustify on notmuch code would be
NOP; currently this is not true for all files because 1) the
configuration is not perfect 2) the coding style of notmuch is not
completely consistent; in particular the treatment of braces after
e.g. for (_) is not consistent.

Some fine tuning by Tomi Olilla.

devel/uncrustify.cfg

@@ -0,0 +1,105 @@
+#
+# uncrustify config file for the linux kernel
+#
+# $Id: linux-indent.cfg 488 2006-09-09 12:44:38Z bengardner $
+# Taken from the uncrustify distribution under license (GPL2+)
+#
+# sample usage:
+#        uncrustify --replace -c uncrustify.cfg foo.c
+#
+#
+
+indent_with_tabs	= 2		# 1=indent to level only, 2=indent with tabs
+align_with_tabs		= TRUE		# use tabs to align
+align_on_tabstop	= TRUE          # align on tabstops
+input_tab_size		= 8		# original tab size
+output_tab_size		= 8		# new tab size
+indent_columns		= 4
+
+indent_label		= 2		# pos: absolute col, neg: relative column
+
+
+#
+# inter-symbol newlines
+#
+
+nl_enum_brace		= remove	# "enum {" vs "enum \n {"
+nl_union_brace		= remove	# "union {" vs "union \n {"
+nl_struct_brace		= remove	# "struct {" vs "struct \n {"
+nl_do_brace             = remove	# "do {" vs "do \n {"
+nl_if_brace             = remove	# "if () {" vs "if () \n {"
+nl_for_brace            = remove	# "for () {" vs "for () \n {"
+nl_else_brace           = remove	# "else {" vs "else \n {"
+nl_while_brace          = remove	# "while () {" vs "while () \n {"
+nl_switch_brace         = remove	# "switch () {" vs "switch () \n {"
+nl_brace_while		= remove	# "} while" vs "} \n while" - cuddle while
+nl_brace_else		= remove	# "} else" vs "} \n else" - cuddle else
+nl_func_var_def_blk	= 1
+nl_fcall_brace		= remove	# "list_for_each() {" vs "list_for_each()\n{"
+nl_fdef_brace		= force		# "int foo() {" vs "int foo()\n{"
+# nl_after_return		= TRUE;
+# nl_before_case	= 1
+
+# Add or remove newline between return type and function name in definition
+nl_func_type_name	= force
+nl_enum_leave_one_liners = True
+nl_enum_brace = Remove
+nl_after_struct = 0
+#
+# Source code modifications
+#
+
+# mod_paren_on_return	= remove	# "return 1;" vs "return (1);"
+# mod_full_brace_if	= remove	# "if (a) a--;" vs "if (a) { a--; }"
+# mod_full_brace_for	= remove	# "for () a--;" vs "for () { a--; }"
+# mod_full_brace_do	= remove	# "do a--; while ();" vs "do { a--; } while ();"
+# mod_full_brace_while	= remove	# "while (a) a--;" vs "while (a) { a--; }"
+
+
+#
+# inter-character spacing options
+#
+
+sp_before_ptr_star	= force
+sp_between_ptr_star	= remove
+sp_after_ptr_star	= remove
+
+# sp _return_paren	= force		# "return (1);" vs "return(1);"
+sp_sizeof_paren		= force		# "sizeof (int)" vs "sizeof(int)"
+sp_before_sparen	= force		# "if (" vs "if("
+sp_after_sparen		= force		# "if () {" vs "if (){"
+sp_sparen_brace		= force
+sp_after_cast		= force		# "(int) a" vs "(int)a"
+sp_inside_braces	= add		# "{ 1 }" vs "{1}"
+sp_inside_braces_struct	= add		# "{ 1 }" vs "{1}"
+sp_inside_braces_enum	= add		# "{ 1 }" vs "{1}"
+sp_assign		= force
+sp_arith		= force
+sp_bool			= add
+sp_compare		= add
+sp_assign		= add
+sp_after_comma		= add
+sp_func_def_paren	= force		# "int foo (){" vs "int foo(){"
+sp_func_call_paren	= force         # "foo (" vs "foo("
+sp_func_proto_paren	= force		# "int foo ();" vs "int foo();"
+sp_brace_else		= force         # "} else" vs "}else"
+sp_else_brace		= force		# "else {" vs "else{"
+#
+# Aligning stuff
+#
+
+align_enum_equ_span	= 4		# '=' in enum definition
+# align_nl_cont		= TRUE
+# align_var_def_span	= 2
+# align_var_def_inline	= TRUE
+# align_var_def_star	= FALSE
+# align_var_def_colon	= TRUE
+# align_assign_span	= 1
+align_struct_init_span	= 0		# align stuff in a structure init '= { }'
+align_right_cmt_span	= 8		# align comments span this much in func
+# align_pp_define_span	= 8;
+# align_pp_define_gap	= 4;
+
+# cmt_star_cont		= FALSE
+
+# indent_brace		= 0