Spelling of furan

[jevandezande]

Solvent input only accepts furane, which is a much less common spelling of furan.

Ideally it would use the common English name, or accept both.

[TyBalduf]

Related issues:

• CPCM-X Solvation Model Does Not Recognize Abbreviations for DMSO and THF #1127
• Add common aliases for various solvents CPCM-X#42

[TyBalduf]

In general, I think it would be beneficial for xTB to adopt a solvent normalization scheme similar to what is done in CPCM-X. It would presumably just be a small update to normalizeSolventName, which currently just handles lowercasing the name.

Currently, any inconsistency in the names used for solvents (e.g. xTB only accepts DCM or ch2cl2 while CPCM-X until recently only accepted methylenechloride) will prevent CPCM_X from being used (or any future subprogram with differences in solvent name.