grc: python 2.6 compatibility fix
Merge remote-tracking branch 'gnuradio-wg-grc/grc_py26_compat_fix' into maint
Merge branch 'maint'
cmake: backport parallel build fix to maint branch
cmake: add parallel build fix to gr_modtool template
Merge branch 'maint'
grc: Reloading blocks forces reload for all open flow graphs.
grc: Reload marks page as modified only if an error occured during import (i.e. ports no longer exist)
grc: adding version information to flowgraph files using XML processing instructions
grc: moving xml pi into nested data