Section id only alphanumerical from 1.8.14

Hello,

I am working on this project : https://sbl.inria.fr/doc, where the 
documentation is done with Doxygen.

We were used to define the id of our sections with the symbol "-" to 
separate the words in the id, but it looks like the convention has 
changed since 1.8.14 and only alpha-numerical characters are accepted.

Unfortunately, we have a large number of pages, and before reviewing the 
whole documention, I wanted to know if there is anything that I am 
missing, like a Doxygen option to turn ON / OFF

Thanks for your awesome work !

Tom.


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