Added support for multiple accounts.
Fixed bug with creating splits.
Merge branch 'master' into multiple_accounts
Data I/O: added content sniffer class for import.
Data IO: merging of overlapping files.

Added function to merge several overlapping files. Currently ignores all
duplicate lines, even ones within the same file.
Single file upload seem to work.
Multiple file upload support and styling.

Added support for uploading multiple CSV files and styled the upload
form with Bootstrap Fileinput.
PIMPed the CSV upload formatting page.
CSV format: empty columns are no longer shown.
Entry detail: fixed bugs

* Fixed bug that prevented creation of entry detail splits.
* Fixed bug where saving changes to an entry would always redirect to
  the entry with primary key 1.
Merge branch 'fileupload' into multiple_accounts