Re: [alreq] Section on counter styles

Arabic math alphabetic characters ususally use a different style than 
regular text characters, for example most modern books in Egypt will 
use Ruqaa for math with some notable differences than regular Ruqaa; 
the alef has a top loop, the dal looks like a Nastaliq hamza except 
when used for functions, for example (see how the enumerated list uses
 the same symbols as math):
![img_20170209_021729-small](https://cloud.githubusercontent.com/assets/93914/22763681/f0399794-ee6e-11e6-81f3-5918c74a3e9e.jpg)

 Older books used Naskh style with similar differences:
![img_20170209_023131-small](https://cloud.githubusercontent.com/assets/93914/22764128/71f86b32-ee71-11e6-96c5-4ff7ff16afd2.jpg)


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