Add help and documentation on actual keyword to the editor menu * octave-qscintilla.cc(context_help_doc): new function for editor menu action; (get_global_textcursor_pos): new function for calculationg the cursor pos; (contextMenuEvent): uses get_global_textcursor_pos now, added context menu entry for documentation; (contextmenu_help,contextmenu_doc): slots for context menu; (contextmenu_help_doc): new common function used from context_help_doc and the context menu slots * octave-qscintilla.h: new functions context_help_doc, contextmenu_doc, contextmenu_help_doc, get_global_textcursor_pos * file-editor-tab.cc(context_help): new slot for editor menu action * file-editor-tab.h: new slot context_help * file-editor.cc(request_context_help,request_context_doc): new slots for help menu entries; (construct): new help menu with keyword help and documentation; (add_file_editor_tab): connect new signal fetab_context_help to the new slot context_help in file_editor_tab; (set_shortcuts): enable/disable new shortcuts when editor focus changes (check_actions): enable/disable new actions depending on existing tabs * file-editor.h: new signal fetab_context_help, new slots request_context_help and request_contest_doc, new help and doc actions

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$