suggestions improvements and fixes

suggestions improvements and fixes

- reindenting Suggestions.pm
- removing useless code in acqui-home.pl & fixing # of pending suggestion display
- add suggestion to order : displaying for selection suggestions accepted by the librarian (and reindenting)
- XHTMLing acqui-home (& removed useless parts)

NOTE ABOUT XHTML (could be useful) : <tfoot> must be BEFORE <tbody> in a <table>, even if, of course, it is displayed after.