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/subsurfacewebservices.cpp

@@ -13,7 +13,7 @@
 #include "../divelist.h"
 
 struct dive_table gps_location_table;
-static gboolean merge_locations_into_dives(void);
+static bool merge_locations_into_dives(void);
 
 SubsurfaceWebServices* SubsurfaceWebServices::instance()
 {
@@ -177,7 +177,7 @@ unsigned int SubsurfaceWebServices::download_dialog_parse_response(const QByteAr
 		return status;
 }
 
-static gboolean is_automatic_fix(struct dive *gpsfix)
+static bool is_automatic_fix(struct dive *gpsfix)
 {
 	if (gpsfix && gpsfix->location &&
 	    (!strcmp(gpsfix->location, "automatic fix") ||
@@ -188,7 +188,7 @@ static gboolean is_automatic_fix(struct dive *gpsfix)
 
 #define SAME_GROUP 6 * 3600   // six hours
 
-static gboolean merge_locations_into_dives(void)
+static bool merge_locations_into_dives(void)
 {
 	int i, nr = 0, changed = 0;
 	struct dive *gpsfix, *last_named_fix = NULL, *dive;