bash_aliases: additions and tweaks

* New Invenio structure aliases;
* Wrapped service alias;
* Kill invenio addition;
* upcswwd alias is now uppu;
* uppu switches to 'next' branch upon completion;
* uppu fetches and rebases instead of fetching and merging;
* flake8 alias;
* cdv is now cd'ing to the correct Invenio directory;
* redis flushdb addition.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>