convert: add tagmap option

Tests have been updated.

hgext/convert/__init__.py

@@ -145,6 +145,10 b' def convert(ui, src, dest=None, revmapfi'
     you want to close a branch. Each entry contains a revision or hash
     separated by white space.
 
+    The tagpmap is a file that exactly analogous to the branchmap. This will
+    rename tags on the fly and prevent the 'update tags' commit usually found
+    at the end of a convert process.
+
     Mercurial Source
     ################
 
@@ -325,6 +329,8 b' cmdtable = {'
            _('change branch names while converting'), _('FILE')),
           ('', 'closemap', '',
            _('closes given revs'), _('FILE')),
+          ('', 'tagmap', '',
+           _('change tag names while converting'), _('FILE')),
           ('', 'branchsort', None, _('try to sort changesets by branches')),
           ('', 'datesort', None, _('try to sort changesets by date')),
           ('', 'sourcesort', None, _('preserve source changesets order')),

tests/test-convert.t

@@ -125,6 +125,10 b''
       you want to close a branch. Each entry contains a revision or hash
       separated by white space.
   
+      The tagpmap is a file that exactly analogous to the branchmap. This will
+      rename tags on the fly and prevent the 'update tags' commit usually found
+      at the end of a convert process.
+  
       Mercurial Source
       ################
   
@@ -271,6 +275,7 b''
       --splicemap FILE   splice synthesized history into place
       --branchmap FILE   change branch names while converting
       --closemap FILE    closes given revs
+      --tagmap FILE      change tag names while converting
       --branchsort       try to sort changesets by branches
       --datesort         try to sort changesets by date
       --sourcesort       preserve source changesets order