Fixed CORE-4472: Message "Modifying function <F> which is currently in use" when running script with AUTODDL=OFF and <F> is called from INTERNAL function declared in other unit.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60375 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4280: FB3: Stored function accepts duplicate input arguments.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60376 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4161: User can not insert records into table with column "generated by default as identity" in its DDL.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60377 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4622: Regression: Trigger with UPDATE OR INSERT statement and IIF() not working as expected.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60378 65644016-39b1-43b1-bf79-96bc8fe82c15
Work in progress on CORE-3632: make all file descriptors, opened by firebird, close on exec()

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60379 65644016-39b1-43b1-bf79-96bc8fe82c15