LDAP: support module load triggered by variable access

Postgres version variances

string-handling: insert space for empty item when building stringlist

Readme.pod removed in favour of up-to-date README.md

last push to github

func prototypes

constify

daemon_modules_preload option

Fix non-LOOKUP_MODULE_DIR build

Docs: build note

Move lookup options & variables from global to module

Keep handle open for module dir

Disable -bI:sieve for sieve-less builds. Bug 3184

Invalidate more variables at smtp-reset

Cmdline option for list of dynamic-load modules