Horace/iFit conflict: use package import

[farhi]

The 'gauss' iFunc conflicts with the 'gauss' old-Mfit function. A way to solve this is to use Matlab 'packages'. This allows to protect the name spaces.

We could then have:

• addpath('iFit_path')
• import ifit.*

which would have e.g.

• ifit.models

as well as other stuff. An other solution is to indicate the conflict, and request user to remove the Horace old functions.

[farhi]

This issue is only relevant for Scripts, e.g.

• Models
• Load
• Signal
• Utility

as well as Libraries:

• Criteria
• Loaders
• Optimizers