fix empty variable for mysql sla procedure

fixes #4152
fix MySQL Connector installation fails on non-bundled JasperServer installations

fixes #4153
import DateHelper support for timeperiod last quarter.

refs #3718
SQL fixes in templates for PostgreSQL

Signed-off-by: Michael Friedrich <Michael.Friedrich@netways.de>

refs #1880
Merge branch 'fix/avail-query-4152' into next
Add new quarter function from patch fixes #3718. Thanks to dirk for providing the patch.
Merge branch 'next' of git.icinga.org:icinga-reports into next
Added new templates to jasper package. refs #1880
update Changelog
tag 1.10.0-beta
Fixed version in footer
fixed footer version in package as well
Merge branch 'next' into support/1.10
detect JasperServer up to 5.20 in configure
Merge branch 'next' into support/1.10

Conflicts:
	configure
update 1.10.0 release date