[scripts][m]: rework and extend scripts and some further fixes.

* refactored script to be cleaner
* add in source info to data
* consolidate data into one big file, sort, add unique id and write to data/all.csv
* datapackage.json brough up to date
[scripts][m]: rework clean up scripts with fixes, improvements etc - now all working (!).

* refactored script to be cleaner
* add in source info to data
* consolidate data into one big file, sort, add unique id and write to data/all.csv
* datapackage.json brough up to date
* Update README
[data/all][l]: all GLA spending data as CSV (~3mb).

First commit ever of consolidated data w00t!.
[gitignore][xs]: .