Olga Sergijenko / gammalib

# Conflicts:
#	AUTHORS
#	include/GTools.hpp
#	src/support/GTools.cpp

The GFft class implements a one-dimensional Fast Fourier transformation. The GFftWavetable class is a support class for GFft and holds the trigonometric coefficients for a factorisation.

…d gammalib::rstrip_chars() function

The gammalib::str() floating point conversion functions now make sure that no precision is lost in a string conversion (well, roughly).

…ent() method since it was actually not needed, added check for unique name of model components, added function to find out if a string is contained in a list of strings to GTools

… methods from GTools.

Removed size() method.

Renamed filename() method to url().
Renamed fullname() method to operator().

…parameter in an XML file.

…tion to load GTIs separately. GFilename now supports selection expression strings

Removed the optional extname argument from:
- GEbounds
- GEnergies
- GGti
- GNodeArray
- GCTAPointing
- GMWLObservation
- GMWLSpectrum

Integrate code (default extno and extver handling in GFilename).

The GFilename::default_extname() has been removed and remplaced by an enhanced GFilename::extname() method that either returns the extension name set in the filename, or if not set, the string that has been provided as argument.

The GFilename class handles the decomposition of the filename into the true filename and a FITS extension name.

gammalib::expand_env replaces ~ or ~user by the user's home directory, ~+ by the value of the PWD environment variable and ~- by the value of the OLDPWD variable. If the user or the PWD or OLDPWD variable are not found, no replacement is done.
Update change-log.

… "Column separated values".

The file existence checking is not to be done in GUrlFile as this class may create a new file. The check needs to be done in GXml.

The handles the case that a directory with specified name exists as fopen() will not give an error when opening a directory.

The introduction of a timeout should avoid locking up the process.