query planner stuff

some gcc -Wall fixes
added suport for _ in identifier names in SQL
gmdb2 manual additions

src/util/updrow.c

@@ -22,17 +22,15 @@
 
 void read_to_row(MdbTableDef *table, char *sargname);
 
+int
 main(int argc, char **argv)
 {
-int rows;
 int i;
-unsigned char buf[2048];
 MdbHandle *mdb;
 MdbCatalogEntry *entry;
 MdbTableDef *table;
-GList *l;
-char *dot, *colname, *tabname;
-char *colop, *colval;
+char *colname, *tabname;
+char *colval;
 char *sargname = NULL;
 char *updstr = NULL;
 unsigned char data[255];