removed hardcoded /home directory to apply the existing configuration options for STORAGE_USER/ROOT if they exist
removed hardcoded /home directory to apply the existing configuration options for STORAGE_USER/ROOT if they exist

Highest priority: the pre set STORAGE_ROOT/USER, midmost priority: the config settings, lowest priority: the default one.

fixes #309; closes #311

jmedding/mailinabox,PortableTech/mailinabox,Toilal/mailinabox,hnk/mailinabox,jprice/mailinabox,Toilal/mailinabox,b-deng/mailinabox,b-deng/mailinabox,pierreozoux/mailinabox,nstanke/mailinabox,jjz/mailinabox,PortableTech/mailinabox,ianberinger/mailinabox,jprice/mailinabox,Neopallium/mailinabox,choltha/mailinabox,m4rcs/mailinabox,Toilal/mailinabox,Toilal/mailinabox,jmedding/mailinabox,pierreozoux/mailinabox,choltha/mailinabox,jjz/mailinabox,hnk/mailinabox,m4rcs/mailinabox,mail-in-a-box/mailinabox,jmedding/mailinabox,b-deng/mailinabox,brocktice/mailinabox,brocktice/mailinabox,ianberinger/mailinabox,d5ve/mailinabox,Neopallium/mailinabox,PortableTech/mailinabox,PortableTech/mailinabox,d5ve/mailinabox,choltha/mailinabox,jprice/mailinabox,pierreozoux/mailinabox,mail-in-a-box/mailinabox,ianberinger/mailinabox,hnk/mailinabox,d5ve/mailinabox,jprice/mailinabox,jjz/mailinabox,m4rcs/mailinabox,choltha/mailinabox,mboersma/mailinabox,mboersma/mailinabox,Neopallium/mailinabox,d5ve/mailinabox,brocktice/mailinabox,jjz/mailinabox,pierreozoux/mailinabox,jprice/mailinabox,mail-in-a-box/mailinabox,ianberinger/mailinabox,nstanke/mailinabox,nstanke/mailinabox,jjz/mailinabox,pierreozoux/mailinabox,b-deng/mailinabox,d5ve/mailinabox,jmedding/mailinabox,Neopallium/mailinabox,mail-in-a-box/mailinabox,m4rcs/mailinabox,choltha/mailinabox,mboersma/mailinabox,nstanke/mailinabox,m4rcs/mailinabox,PortableTech/mailinabox,brocktice/mailinabox,nstanke/mailinabox,mboersma/mailinabox,hnk/mailinabox,jmedding/mailinabox,b-deng/mailinabox,mboersma/mailinabox,brocktice/mailinabox,Neopallium/mailinabox,ianberinger/mailinabox