support for configure 2.5

recover memory in catch/throw.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@75 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

TO_DO

@@ -13,7 +13,7 @@ BEFORE 4.4:
 - library(system) for WIN32
 - document system(library)
 - document new interface functions.
-- remove pl/nfr.yap and misc/yap.spec from CVS.
+- ^C can break code.
 
 TO CHECK:
 - bad register allocation for a(X,Y) :- X is Y+2.3 ?
@@ -21,6 +21,7 @@ TO CHECK:
 TABLING
 - pass all tabling tests from Kostis and Bart paper
 - handle floats, long ints and friends in tables.
+- make gc work after mutable var changes.
 - knap-sack
 
 AFTER 4.4(?)
@@ -32,7 +33,6 @@ AFTER 4.4(?)
 - garbage collector cleans up clauses and logical update DB.
 - atom garbage collector.
 - lpdoc.
-- deterministic trail entries for multi-assignment variables.
 
 DONE:
 - compilation of bignums.
@@ -72,3 +72,5 @@ DONE:
 - listing (Steve Moyle).
 - logtalk.
 - fix bugs from Nicos.
+- remove pl/nfr.yap and misc/yap.spec from CVS.
+- deterministic trail entries for multi-assignment variables.