v0.2f

• powerset
• apl encode/decode
• generalise outer-product
• fft/ifft
• saca bwt/sais
• lu decomposition
• exit
• startswith
• fix shannon entropy
• better support for standalone scripts
• implement caar, cdar, cadr, cddr
• isnil
• insert
• insertall
• huffman coding code example
• pattern matching in let and def
• decrease the amount of allocations in function registry