LINGOT Is Not a Guitar-Only Tuner

This release adds src/lingot-i18n.h, makes the
configuration dialog more
"GTK-compliant", fixes charset problems in the
Spanish translation, the
size of the "Note" frame on main window, and two
SIGSEGV bugs, removes
some deprecated gtk calls, renames src/tuner.cc to
src/lingot.cc,
updates the es translation, and uses
GtkAboutDialog to show "about"
information.

Files have been reorganized to a more "GNU-like" structure. Multi-lingual support has been added.

The program now depends on the GTK2 library. Minor
bugfixes were made.