impl: pack8, pack16, pack32
more detailed error check.  fix pack5
impl. pack6
impl. pack7
impl. pack13
impl. pack14
impl. pack15
add scripts to generate pack and unpack functions
add comment
fix scripts and generated files
replace packN() functions with generated version
replace unpackN() functions with generated version
Merge pull request #4 from koron/expand-pack-funcs

Expand pack funcs