lua: make Processor.deleter
lua: reorder methods of Processor

Method .get_block_sets() was moved near to
declare_bs()
processor AllProcessors2

prettier output, than AllProcessors
AllProcessors2: omit repeated children
AllProcessors2: use <i> instead of <b> for lists
AllProcessors2: properly detect "no blocksets"
AllProcessors2: fix stupid typo
Processor.name(): avoid P-str -> C-str -> P-str

P-stg = std::string
C-str = C-string
Info: "failed to build stem" is warning

This message is not a fatal error,
but could be considered as.