[doc] Add warning about printing issues in Debian Squeeze
[doc] Add warning about printing issues in Debian Squeeze

Review format of info added in INSTALL file and add warning in specific sections

FEA: ItEr75S03CommunityMaterial

LibrePlan/libreplan,PaulLuchyn/libreplan,dgray16/libreplan,dgray16/libreplan,dgray16/libreplan,LibrePlan/libreplan,dgray16/libreplan,poum/libreplan,Marine-22/libre,poum/libreplan,skylow95/libreplan,skylow95/libreplan,PaulLuchyn/libreplan,PaulLuchyn/libreplan,PaulLuchyn/libreplan,skylow95/libreplan,poum/libreplan,LibrePlan/libreplan,skylow95/libreplan,dgray16/libreplan,PaulLuchyn/libreplan,LibrePlan/libreplan,LibrePlan/libreplan,Marine-22/libre,Marine-22/libre,Marine-22/libre,Marine-22/libre,PaulLuchyn/libreplan,poum/libreplan,PaulLuchyn/libreplan,dgray16/libreplan,poum/libreplan,LibrePlan/libreplan,LibrePlan/libreplan,Marine-22/libre,skylow95/libreplan,dgray16/libreplan,skylow95/libreplan,poum/libreplan