1.21.1.0

1.21.1.0
new function phrasea_utf8_convert_to(string s, string method) returns string
method :
"LC"   : lowercase
"ND"   : no-diacritics
"LCND" : lowercase no-diacritics

1.21.0.2
fix : query "thumbnail=0" returned always 0 answers (#1151)