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>

file.c

@@ -4,7 +4,12 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#if 0
 #include <glib/gi18n.h>
+#else /* stupid */
+#define _(arg) arg
+#define N_(arg) arg
+#endif
 #include <zip.h>
 
 #include "dive.h"
@@ -24,7 +29,7 @@ int readfile(const char *filename, struct memblock *mem)
 	mem->buffer = NULL;
 	mem->size = 0;
 
-	fd = g_open(filename, O_RDONLY | O_BINARY, 0);
+	fd = open(filename, O_RDONLY | O_BINARY, 0);
 	if (fd < 0)
 		return fd;
 	ret = fstat(fd, &st);
@@ -232,7 +237,7 @@ static int try_to_open_csv(const char *filename, struct memblock *mem, enum csv_
 		struct sample *sample;
 
 		errno = 0;
-		val = g_ascii_strtod(p,&end);
+		val = strtod(p,&end); // FIXME == localization issue
 		if (end == p)
 			break;
 		if (errno)