BEFORE 4.4:
- mixed constraints and delays.
- write infinite terms
- constraints in DB.
- fix SBA plus co-routining
- non-void temporaries going to global
- interrupt handling in WIN32
- timestamps on files.
- warnings in documentation file.
- system library
- fixed restore when code is moved around.

TO CHECK:
- bad register allocation for a(X,Y) :- X is Y+2.3 ?

TABLING
- pass all tabling tests from Kostis and Bart paper
- handle floats, long ints and friends in tables.

AFTER 4.4(?)
- change compilation order for arguments
- fix code for arithmetic
- large memory configurations on 32 bit machines (3GB).
- big data-bases
- CLP(FD)
- garbage collector cleans up clauses and logical update DB.
- atom garbage collector.
- lpdoc.
- deterministic trail entries for multi-assignment variables.

DONE:
- compilation of bignums.
- expansion in the middle of compilation.
- garbage collect multiple assignment variables properly.
- read inf, nan, improve print_message.
- Too large term in copy_term.
- block.
- include Stasinos patches for gmp configuration and documentation.
- debug new code for delays
- debug new code for attributes.
- bug in CHR, run3, deussen1(X).
- functor
- check how terms are written by debugger
- tabling garbage collector.
- port to HP-UX (4.3.15)
- port to Alpha (4.3.15)
- fix trail overflow in gc
- fix opt.mavar.h trouble
- fix [] lookup
- fix documentation complaint
- fix overflow in tab_fib
- fix rpm build
- build problems with cygwin 1.1.7?
- Trail Overflow in WIN32.
- save/restore for DB
- Ashwin bug on storing floats as head of db term.
- save/restore for arrays.
- save/restore for arithmetic.
- fix aliases, user error, etc.
- set user_input, user_output, and user_error
- include Mandrake makefiles
- system enters loop if predicate exported by module is not defined. 
- copying garbage collector: implemented hybrid
- dif example in Manual.
- initial port to OS_X