• add possibility to set umask for files opened by utl_file.fopen

fix crash #260

before fix there was a possibility to call 2x time
fclose agaist one FILE pointer (when fclose returned some error).
But the pointer used as argument of fclose should not be used ever.

Full Changelog: VERSION_4_9_3...VERSION_4_9_4

• fix broken handling null in dbms_sql.column_value

• fix possible crashes in dbms_sql and plvlex functions

• better compatibility with Oracle for function dbms_random.string

• mark some function parallel safe
• fix dbms_sql.debug_cursor
• fix compatibility issue of oracle.regexp_count, oracleregexp_substr functions

• remainder function should be strict

• fix upgrade from 4.5.0

• dbms_alert uses condition variables for synchronization (less latency) (pg13+)

• partial rewriting of dbms_pipe. Now, the synchronization is based on signals instead short sleeping.