Add possibility to edit the function related to the actual keyword in editor * octave-qscintilla.cc(get_actual_word): new internal function; (context_help_doc): uses new function get_actual_word; (contextMenuEvent): new context menu for editing function of actual keyword (context_edit): function for edit action in editor file menu; (contextmenu_edit): new slot for context menu; * octave-qscintilla.h: new functions context_edit, contextmenu_edit, get_actual_word * file-editor-tab.cc(context_edit): new slot for editor menu action * file-editor-tab.h: new slot context_edit * file-editor.cc(request_context_edit): new slot for file menu entry; (construct): new entry in file menu for editing function of actual keyword; (add_file_editor_tab): connect new signal fetab_context_edit to the new slot context_edit in file_editor_tab; (set_shortcuts): enable/disable new shortcut when editor focus changes (check_actions): enable/disable new action depending on existing tabs * file-editor.h: new signal fetab_context_edit, new slot request_context_edit, new edit function action

syntax: regexp
# The recurrent (^|/) idiom in the regexps below should be understood
# to mean "at any directory" while the ^ idiom means "from the
# project's top-level directory".

# gnulib makes these silly backup files
.~$

# This directory gets created by gnulib during the build. 
# It contains no Octave files.
^libgnu/*

# This directory mostly contains cruft during build time, but it does
# contain some Octave code, so we gotta be a bit more careful about
# what we ignore here
^m4/(?!ax_).+\.m4$

# Emacs tools create these
(^|/)TAGS$
(^|/)semantic.cache$

(/|^)Makefile\.in$
^INSTALL$

^aclocal\.m4$
^build-.*($|/)
^configure$
^autom4te\.cache($|/)
^config\.in\.h$

# e.g. doc/faq/OctaveFAQ.info
#      doc/interpreter/octave.info-4
^doc/.*\.info(-\d)?$

^doc/\w*/stamp-vti$
^doc/\w*/version\.texi$
^doc/interpreter/images\.mk$

# e.g. liboctave/operators/smx-op-inc.mk
^liboctave/operators/\w+-op-\w+\.mk$

^libinterp/dldfcn/module\.mk$