grc: making qt-gui the default (Feature #634)
grc: show fg return code if not 0 (Bug #726)
grc: switch timestamp in grc files from modified to created
grc: move font size definition in Constants.py
grc: yet another py26 incompatibility
grc: fix search entry box for old PyGTK versions
grc: update all flowgraphs when hiding port labels
grc: no icon in search entry box for old PyGTK versions
grc: fix lagging drag and drop
grc: fix missing xterm (Bug #725)
grc: fix lagging drag and drop, round two
Merge remote-tracking branch 'gnuradio-wg-grc/maint_grcwg' into maint
Merge branch 'maint'
Merge remote-tracking branch 'gnuradio-wg-grc/master_grcwg'
blocks: better handling of srcid with vector_source blocks.

 - vector_source now adds the srcid of the tag to the actual tag stream.
 - tag_utils' python_to_tag can now be called with just 3 parameters by omitting the srcid; gets filled in with PMT_F.
 - updated vector_source_with_tags example to have tags with and without srcid set.