* .gitignore: add paramflags generated files to ignore list.
    * glib/glibmm.h: add paramflags header to include list.
    * glib/glibmm/property.{cc|}h: add constructors allowing set nick,
      blurb. Add getters for this values.
      and flags of property.
    * glib/glibmm/value.{cc|h}:
    * glib/src/filelist.am: add paramflags to a build.
    * glib/src/enums.{ccg|hg}: add GParamFlags enum wrapper.
    * glib/glibmm/value_basictypes.{cc|h}.m4: add
      overloaded create_param_spec() for setting additional property
      parameters.

This patch fixes bug #755256