DOCS: Add detailed explanation on C-extension errors
DOCS: Add detailed explanation on C-extension errors

Add an explanation of the various errors thrown by the C extensions when calculating texture features in the C extensions to the FAQ section of the documentation. Also add some pointers to potential solutions where appropriate.

Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics