open_apqc.py multisubject support

[hanayik]

• open_apqc.py should accept a list to multiple index.html files as input (e.g. a glob that gets expanded).
• need a function to parse list of inputs to get the shared path component. Output of this function will have common_path, and list of remainder paths to subject specific index.html files
• minimal common_path will be grandparent directory of single subject index.html
• add option --auto-open (default true). opens all browser tabs for each subject input
• QC saving: send JSON with {'file_id': window.location.pathname, 'qc_dict': <QC_OBJECT_HERE>}

[mrneont]

To be done by @hanayik and @mrneont ...

[mrneont]

@hanayik : this commit 38fafb9 should take care of the first three items listed.