Add missing class variables to plotter storage

See merge request !75

Implement missing prototypes handling

Closes #79

See merge request !74

There's no prototype available for the experiment as it
needs to be configured with the content of a prefix based
on the toolchain selected for it.

This allows the creation of a database from scratch.

The prototype code is also updated for the latest version
of the database API.

Fix plotterparameter writing

Closes #78

See merge request !73

The write method was wrong as well as there were missing
pieces in the class for it to work properly.

Improve asset information

See merge request !72

Add db migration scripts to installed commands

See merge request !70

Implement support for protocol template prototype

See merge request !71

Add a plotterparameter schema file

Closes #66

See merge request !55

Adds schema file, beat.core integration, test files & tests

Closes #66

Fix simple/2 database code

See merge request !68

The migration script didn't properly copy the code.

Protocol template

See merge request !67

Version of beat.env.system.python to 1.3.0r5
Version of beat.env.db.example to 1.4.0r5

It was useless since the file path was store in an unrelated
variable.

This scripts creates the needed protocol templates unless a protocol
template with the same name already exists.

Add BEAT framework classifier

Closes #75

See merge request !66

Factorize simplejson

See merge request !64