CheckStyleBear: Fix offset convention
CheckStyleBear: Fix offset convention

Map 0-based checkstyle column convention to 1-based coala convention.
Convert 0 line number to None.

Fixes https://github.com/coala/coala-bears/issues/2563

refeed/coala-bears,coala-analyzer/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,refeed/coala-bears,coala/coala-bears,coala/coala-bears,refeed/coala-bears,refeed/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,refeed/coala-bears,refeed/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,refeed/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala/coala-bears