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>

save-xml.c

@@ -125,12 +125,12 @@ static void show_utf8(FILE *f, const char *text, const char *pre, const char *po
 
 	if (!text)
 		return;
-	while (g_ascii_isspace(*text))
+	while (isspace(*text))
 		text++;
 	len = strlen(text);
 	if (!len)
 		return;
-	while (len && g_ascii_isspace(text[len-1]))
+	while (len && isspace(text[len-1]))
 		len--;
 	/* FIXME! Quoting! */
 	fputs(pre, f);
@@ -549,13 +549,13 @@ void save_dives(const char *filename)
 	save_dives_logic(filename, FALSE);
 }
 
-void save_dives_logic(const char *filename, const gboolean select_only)
+void save_dives_logic(const char *filename, const bool select_only)
 {
 	int i;
 	struct dive *dive;
 	dive_trip_t *trip;
 
-	FILE *f = g_fopen(filename, "w");
+	FILE *f = fopen(filename, "w");
 
 	if (!f)
 		return;