Fix todo list

 - ssl_expr_parse.y ........ expression parser source

 - ssl_expr_eval.c ......... expression machine evaluation

 - ssl_scache.c ............ session cache abstraction layer

 # ssl_scache_dbm.c ........ session cache via DBM file

 - ssl_scache_dbm.c ........ session cache via DBM file

 - ssl_scache_shmcb.c ...... session cache via shared memory cyclic buffer

 - ssl_scache_shmht.c ...... session cache via shared memory hash table

 - ssl_util.c .............. utility functions

 # ssl_util.c .............. utility functions

 # ssl_util_ssl.c .......... the OpenSSL companion source

 # ssl_util_ssl.h .......... the OpenSSL companion header

 # ssl_util_table.c ........ the hash table library source