pycrires v0.3.1

• Fixed sorting of filenames in time when using glob
• Save trace plots in calib/util_trace instead of raw (thanks @avigan!)
• Setting manually the wavelength setting with the wavel_setting parameter (thanks @avigan and @DenisAll!)
• Fixed indentation issue in unit tests
• Fixed bug in if-condition that checked for SCIENCE frames
• Fixed issue with master flat not being included since UTIL_MASTER_FLAT is no longer supported
• Added the create_sof parameter to the Pipeline methods that call an EsoRex routine
• Updated documentation and code style improvements
• Overall maintenance and several minor improvements