added second calculation period
added visual support for 2 calculation periods
changed calculation support to new naming convention for first period
improved visual quality
added includes/GetConfig.php to externalize configuration retrieval
changed to working db scheme
changed getIntervalQuery so it can be used for multiple calculation times
added pending db scheme
use pending db to temporary store calculation time a values
corrected typing errors
corected wrong storing order
minor fixes
visual improvements
fixed bug where articles, not sold in calc time b seemd to be not sold at all
Merge branch 'feature/AddSecondCalculationPeriod' into develop
added support for red marking