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-gui.cpp

@@ -1,7 +1,9 @@
 /* qt-gui.cpp */
 /* Qt UI implementation */
 #include <libintl.h>
+#if 0
 #include <glib/gi18n.h>
+#endif
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -64,7 +66,10 @@ Translator::Translator(QObject *parent):
 QString Translator::translate(const char *context, const char *sourceText,
 			      const char *disambiguation) const
 {
+	return sourceText;
+#if 0
 	return gettext(sourceText);
+#endif
 }
 
 static QApplication *application = NULL;
@@ -141,7 +146,7 @@ void exit_ui(void)
 		free((void *)default_dive_computer_device);
 }
 
-void set_filename(const char *filename, gboolean force)
+void set_filename(const char *filename, bool force)
 {
 	if (!force && existing_filename)
 		return;