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Add postgresql support

Closes #3237

See merge request !18

Add specific policy files for irc.gimp.org and irc.gnome.org

See merge request !20

Even if we built with postgresql’s support

Fix a somewhat big memory leak

Do not fail to compile when one of them is missing but the other one is not.

Raise an error when trying to open a database with the missing library.

see #3237

Some fixes for the postgresql branch

See merge request !19

.release() returns the pointer and releases ownership *without*
destruction.

I got an ASAN error otherwise (type mismatch)

(cf. https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNSTRING)

fix #3315

ref #3278

Most importantely, include parsing.h, since read_cfg is not implicitely
included anymore in botan 2.3, and that does not compile.

Also do not included botan.h anymore, since it’s deprecated in botan 2.3

fix #3296

Stop allowing the 1024-bit for irc.ppirc.net

See merge request !16

compat: revert to using sqlite's close() function for compat with older distros.

See merge request !17

 close_v2(), in use before this commit, was introduced as part of sqlite 3.7.14
 (2012-09-03), and is as such incompatible with debian wheezy (3.7.13) and
 centos6 (3.6.20).
 FTR, Wheezy will be supported until May 2018, and centos6, until November 2020.

Set symbol visibility to hidden in cmake

See merge request !15

This reduces the size of the final binary by 12% by not including
symbols, and thus function bodies that have been inlined for example.

fix #3293