* alisp.org: reset state of Unit tests to TODO
* alisp.org: take sv_t tasks out of the backlog and set to WIP
* sv: add prototypes for sv_chop_{left,right} and sv_substr
* sv: implement sv_chop_{left, right} and sv_substr
* sv: sv_till and sv_while
* sv: add sv_truncate
When you just want to decrease to a specific size, sv_chop_right is a
bit cumbersome.
* alisp.org: Update and adjust