linux backport

file exists system predicate
$source_file -> $user source
hide and make system preds
fix check_head_and_body
user_expansion never fails
goal expansion is controlled b dynamic procedure
add must_be_of_type predicate_indicator
fix neat_call, debug flag is user controlled
use simplecudd, not ptoblogbdd
compile all of myddas
fx junk in file_name
fix warnings
use common file opening struct and funds
avoid pairs module
fix db queues

cmake/FindMySQL.cmake

@@ -13,13 +13,14 @@ ENDIF (MYSQL_INCLUDE_DIR)
 FIND_PATH(MYSQL_INCLUDE_DIR mysql.h
   /usr/local/include/mysql
   /usr/include/mysql
+  /usr/include/mariadb
 )
 
-SET(MYSQL_NAMES mysqlclient mysqlclient_r)
+SET(MYSQL_NAMES mysqlclient mysqlclient_r mariadb )
 FIND_LIBRARY(MYSQL_LIBRARY
   NAMES ${MYSQL_NAMES}
   PATHS /usr/lib /usr/local/lib
-  PATH_SUFFIXES mysql
+  PATH_SUFFIXES mysql mariadb
 )
 
 IF (MYSQL_INCLUDE_DIR AND MYSQL_LIBRARY)