Up version number to 2.3.1

Also set AUDACITY_BUILD_LEVEL back to 0.

appveyor.yml

@@ -2,7 +2,7 @@
 #if you want to work on this, please talk with us on
 # https://lists.sourceforge.net/lists/listinfo/audacity-devel
 #build time is circa 7 mins.
-version: 2.3.0-alpha-{build}
+version: 2.3.1-alpha-{build}
 branches:
   only:
   - prefs

audacity.dox

@@ -38,7 +38,7 @@ PROJECT_NAME           = Audacity
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2.2.2
+PROJECT_NUMBER         = 2.3.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

locale/audacity.pot

@@ -6,7 +6,7 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: audacity 2.3.0\n"
+"Project-Id-Version: audacity 2.3.1\n"
 "Report-Msgid-Bugs-To: audacity-translation@lists.sourceforge.net\n"
 "POT-Creation-Date: 2018-08-31 22:53+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"

src/Audacity.h

@@ -39,7 +39,7 @@
 // Its value may be more than 0 for pre-release "Beta" builds that differ only
 // in the welcome screen, and hiding of some development menu commands, but
 // still link to the alpha manual online.
-#define AUDACITY_BUILD_LEVEL 2
+#define AUDACITY_BUILD_LEVEL 0
 
 // used #ifdef not #if for IS_ALPHA, IS_BETA, IS_RELEASE, USE_ALPHA_MANUAL
 #undef IS_ALPHA
@@ -62,7 +62,7 @@
 // Increment as appropriate every time we release a NEW version.
 #define AUDACITY_VERSION   2
 #define AUDACITY_RELEASE   3
-#define AUDACITY_REVISION  0
+#define AUDACITY_REVISION  1
 #define AUDACITY_MODLEVEL  0
 
 #if defined(IS_BETA)