icons in png
fixbug in PanelListActions (using old pointer of Action)
relook PanelAct*
add _nbText in ActLearn
gui for ActLearn
fixbug in parseKnowledge en implement getNumberTextByKnowledge and getNumberKnowledge
add getNumberText
implement List::getText
update DialogActLearn
creat stringToKnowledge and stringToKnowledge in List
renam stringToKnowledge to knowledgeToString in List
setup knowledge in DialogActLearn::setupText
ok for nextText