gui: provide prefernces for the octave directory at startup * settings-dialog.ui: add check box for restoring previous octave directory and line edit / file dialog for setting startup directory * settings-dialog.cc (constructor): init new input widgets from settings; (write_changed_settings): wirte values from new widgets into settings file; (get_octave_directory): new slot for settings octave dir in a file dialog * main-window.h: new slot handle_octave_ready * main-window.cc (handle_octave_ready): depending on settings set octave directory to the last one from the previous session, the one set in the settings or the current one; (construct): do not set dir here but in handle_octave_ready; (construct_octave_qt_link): pass 'this' to octave link as parent; * octave-interpreter.h: new signal inidication interpreter is initialized * octave-interpreter.cc (constructor): emit new signal after init of interpreter * octave-qt-link.cc (constructor): connect new signal with slot in main window

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$