First steps towards removing glib dependencies

- remove the build flags and libraries from the Makefile / Configure.mk
- remove the glib types (gboolean, gchar, gint64, gint)
- comment out / hack around gettext
- replace the glib file helper functions
- replace g_ascii_strtod
- replace g_build_filename
- use environment variables instead of g_get_home_dir() & g_get_user_name()
- comment out GPS string parsing (uses glib utf8 macros)

This needs massive cleanup, but it's a snapshot of what I have right now, in
case people want to look at it.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.cpp

@@ -20,7 +20,6 @@
 #include "divelistview.h"
 #include "starwidget.h"
 
-#include "glib.h"
 #include "../dive.h"
 #include "../divelist.h"
 #include "../pref.h"
@@ -36,8 +35,6 @@
 #include "about.h"
 #include "printdialog.h"
 
-#include "glib/gi18n.h"
-
 static MainWindow* instance = 0;
 
 MainWindow* mainWindow()