fixing concatenation of basepaths and file paths during sample initialization…

Release notes

Using the automatic sample discovery with a path not ending with a trailing slash (/) could in some cases cause invalid file paths to be used to open samples producing a large amount of errors. Resolves #67 (closed)

Details

Adjusted that TQFolder::concatPaths now only removes one / from the beginning/end of the two parts to be concatenated (after which they are concatenated with one, additional, single '/' again. This makes sure also "paths" like

root://eosuser.cern.ch//eos/user/f/foo

stay valid if the split was initially after the server address (the old implementation would cause an invalid path root://eosuser.cern.ch/eos/user/f/foo ; note the single slash!).

This then allowed to use TQFolder::concatPaths to also concatenate the base path, which, in case of local files, is essentially the path the user supplies as the mc or data location.