solaR 0.21
==========

solaR is now able to calculate from both daily and sub-daily irradiation values. These are the
most important changes:

*calcSol and fSolI gain a "BTi" argument for intradaily time bases.

*fCompI gains a "G0I" argument for intradaily irradiation series.

*fCompI gains both "corr" and "f" arguments.

*calcG0, calcGef, prodGCPV and prodPVPS gain a new "bdI" argument for intradaily irradiation, 
and the "corr", "f" arguments.

*The "bd" (and the new "bdI") argument of "calcG0" can be now a "Meteo" object. 
The "file" component of this argument can be now a "zoo" object.

*New methods ("losses", "compareLosses" and "compare") are available for "Gef" and "ProdGCPV" classes.

*The "corr" argument of "fCompD" (and "fCompI") can be now "corr=none".

*The correlations between the diffuse fraction and the clearness index are now 
coded outside "fCompD" as separate functions. 
Several new correlations have been included, both for monthly/daily values and for intradaily values.

*New small functions for difftime objects have been included.

*Small bugs have been fixed.
------------

solaR 0.20
==========

*The package is now almost entirely designed with S4 classes and methods.
*The time series object are constructed with the 'zoo' package.
*Most of the functions and arguments have been renamed in order to 
ease the understanding by international users.
*Two new functions have been included for the statistical analysis of a PV plant composed of several systems.
*The package dependencies have been optimized.
*Several new small functions for date-time calculations are now available.
*Several bugs have been corrected.