GW recharge, BRF and new project management interface

New features:

• Added BRF calculation in WHAT
• Allows xlsx water level datafiles (in addition to xls) to be loaded in WHAT
• Project info are now saved in a database using the HDF5 format instead of a text file. Water level and weather datasets can now be imported in the project. Since data are not loaded from the source file anymore, this greatly improves the performance of the system. Moreover, it makes the saving of results easier.
• Added GW recharge estimation in the GUI

GUI improvements:

• Added mouse x coordinate at the bottom of the graph in computation mode
• Removed About Tab and added an icon instead

Bug fixes and performance improvements:

• Python 3.4 compatibility bug fixes
• Important improvement of the plotting of the vertical guide for adding peak to the hydrograph.
• Removed useless/annoying warning messages
• Made the loading of weather data file faster in gapfillgui
• Fixed a bug that made the calculation of the MRC fails when there was missing data in the water level time series.
• Code was cleaned and repo was restructured
• Solved a bug when space in Windows path
• It is now possible to set whether data are removed from the dataset or not in the cross validation procedure. If not, the MLR model is not redefined each day and the memory buffer is used instead, which allow to greatly speed up the process.
• water level measurement was not read when there was only one data in the waterlvl_manual_measurements.xls file
• Solved clipping issue in EMF format for weather average
• Added info about MRC units in the equation
• Removed a lot of dependancies to pyplot
• Added nan support for the calcul of ETP