Updated ingest_from_svo notebook and filter data files

[jaladh-singhal]

1. It fixes the problems in issue Error in loading certain filters #13 by adding the data cleaning script within the ingestion script (in notebook). Also it does some python3, etc. necessary changes.
2. It has updated the filter data files by adding new files that were not present last time of commit (since SVO updates itself by adding new filters) and by renaming rest of files by adding .dat extension.

This adding of extension is necessary because earlier file names were in <instrument>.<filter> format, thus GitHub is identifying filter names such as J, C, G, etc. as extensions and showing wrong language status (Jasmin, C, GAP, etc. respectively) of the wsynphot. Thus we need to explicitly add .dat while defining filenames in the ingestion script.

[wkerzendorf]

let's take all the SVO files out - they shouldn't have been added in the first place.