Add proper detection of folders
Fix size computation for folders when MLST is not supoorted
Workaround for the weird behaviour of nlst function when multiple subdirectories are used
Format urls when spaces are present in directories name
Increase timeout when waiting for a database lock
refs #2699, #2693, #2686, #2360, #2409
PTN plugin: fix for data scraping; login session persistence between searches
Make session persistent between searches
fix download URL construction error
Revert "Make __version__ specification PEP8 compliant"

This reverts commit f79a2adbdf11b86e5590b1d8c241e23ff9034d0c.
Merge pull request #344 from TomSpyCell/develop

Several fixes to ftp_list plugin