html truncate

find a little bug in the truncate function of EL_Db class.
the regexp used to reconstruct the html is not complete:
{</?([a-z]+)[^>]*>|&#?[a-zA-Z0-9]+;}
this way it does not close h* elements correctly ’cause does not catch the number following the h, leading to a wrong </h> closing tag.

fix:
add digit metacharacter with optional quantifier in the first group
{</?([a-z]+\d?)[^>]*>|&#?[a-zA-Z0-9]+;}

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