Merge pull request #536 from apartensky/master

Tcga Presets (again)
Tcga Presets - added filter, default sort by disease name
Tcga Presets - added clickable sort columns
Tcga Presets - fix table list formatting
Tcga Preset - added import limit of 50 samples
Tcga Presets - added 'working ...' message on import
Tcga Presets - remember the sample annotations selected at the time of import