merge site_install into database config rather than overwriting it.
merge site_install into database config rather than overwriting it.


Former-commit-id: 6d85745f2c5274153e5e491d952f4334bc48ccf9
olsgreen/concrete5,a3020/concrete5,jaromirdalecky/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,deek87/concrete5,olsgreen/concrete5,biplobice/concrete5,mlocati/concrete5,acliss19xx/concrete5,deek87/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,acliss19xx/concrete5,hissy/concrete5,mainio/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,deek87/concrete5,MrKarlDilkington/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,mainio/concrete5,hissy/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,hissy/concrete5,biplobice/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,deek87/concrete5,jaromirdalecky/concrete5,hissy/concrete5,triplei/concrete5-8,mlocati/concrete5,a3020/concrete5,acliss19xx/concrete5,KorvinSzanto/concrete5,mlocati/concrete5,KorvinSzanto/concrete5,mainio/concrete5,mlocati/concrete5,triplei/concrete5-8,haeflimi/concrete5,haeflimi/concrete5,rikzuiderlicht/concrete5,triplei/concrete5-8