Use Log.e in GCLogin only when a developer intervention is expected
Use Log.e in GCLogin only when a developer intervention is expected

Close #6458.

Bananeweizen/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,cgeo/cgeo,cgeo/cgeo,Bananeweizen/cgeo,cgeo/cgeo,cgeo/cgeo,kumy/cgeo,superspindel/cgeo,matej116/cgeo,rsudev/c-geo-opensource,matej116/cgeo,auricgoldfinger/cgeo,kumy/cgeo,pstorch/cgeo,pstorch/cgeo,S-Bartfast/cgeo,Bananeweizen/cgeo,rsudev/c-geo-opensource,matej116/cgeo,kumy/cgeo,S-Bartfast/cgeo,superspindel/cgeo,rsudev/c-geo-opensource,pstorch/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,superspindel/cgeo,S-Bartfast/cgeo