debian: bump SONAME

Note that this is one of those cases where an ABI change is not
obvious from the symbols file. Several previously void functions now
have return codes.

debian/changelog

@@ -1,3 +1,10 @@
+notmuch (0.19-1) UNRELEASED; urgency=low
+
+  * New upstream version
+  * Bump libnotmuch SONAME because of API changes
+
+ -- David Bremner <bremner@debian.org>  Tue, 16 Sep 2014 21:02:17 +0200
+
 notmuch (0.18.1-2) unstable; urgency=medium
 
   * Update build-deps to use emacs24 on buildd (Closes: #756085)

debian/control

@@ -29,7 +29,7 @@ Vcs-Browser: http://git.notmuchmail.org/git/notmuch
 
 Package: notmuch
 Architecture: any
-Depends: libnotmuch3 (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
+Depends: libnotmuch4 (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
 Recommends: notmuch-emacs | notmuch-vim | notmuch-mutt | alot,  gnupg-agent
 Description: thread-based email index, search and tagging
  Notmuch is a system for indexing, searching, reading, and tagging
@@ -39,7 +39,7 @@ Description: thread-based email index, search and tagging
  .
  This package contains the notmuch command-line interface
 
-Package: libnotmuch3
+Package: libnotmuch4
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
@@ -56,7 +56,7 @@ Description: thread-based email index, search and tagging (runtime)
 Package: libnotmuch-dev
 Section: libdevel
 Architecture: any
-Depends: ${misc:Depends}, libnotmuch3 (= ${binary:Version})
+Depends: ${misc:Depends}, libnotmuch4 (= ${binary:Version})
 Description: thread-based email index, search and tagging (development)
  Notmuch is a system for indexing, searching, reading, and tagging
  large collections of email messages in maildir or mh format. It uses
@@ -69,7 +69,7 @@ Description: thread-based email index, search and tagging (development)
 Package: python-notmuch
 Architecture: all
 Section: python
-Depends: ${misc:Depends}, ${python:Depends}, libnotmuch3 (>= ${source:Version})
+Depends: ${misc:Depends}, ${python:Depends}, libnotmuch4 (>= ${source:Version})
 Description: python interface to the notmuch mail search and index library
  Notmuch is a system for indexing, searching, reading, and tagging
  large collections of email messages in maildir or mh format. It uses
@@ -82,7 +82,7 @@ Description: python interface to the notmuch mail search and index library
 Package: python3-notmuch
 Architecture: all
 Section: python
-Depends: ${misc:Depends}, ${python3:Depends}, libnotmuch3 (>= ${source:Version})
+Depends: ${misc:Depends}, ${python3:Depends}, libnotmuch4 (>= ${source:Version})
 Description: Python 3 interface to the notmuch mail search and index library
  Notmuch is a system for indexing, searching, reading, and tagging
  large collections of email messages in maildir or mh format. It uses
@@ -162,7 +162,7 @@ Package: notmuch-dbg
 Architecture: any
 Section: debug
 Priority: extra
-Depends: ${shlibs:Depends}, ${misc:Depends}, libnotmuch3 (= ${binary:Version})
+Depends: ${shlibs:Depends}, ${misc:Depends}, libnotmuch4 (= ${binary:Version})
 Description: thread-based email index, search and tagging - debugging symbols
  Notmuch is a system for indexing, searching, reading, and tagging
  large collections of email messages in maildir or mh format. It uses

debian/libnotmuch4.symbols

@@ -1,4 +1,4 @@
-libnotmuch.so.3 libnotmuch3 #MINVER#
+libnotmuch.so.4 libnotmuch4 #MINVER#
  notmuch_database_add_message@Base 0.3
  notmuch_database_begin_atomic@Base 0.9~rc1
  notmuch_database_close@Base 0.13~rc1