support for string literals
improve graphical output
better compilation error handling in example rake task
fix stack handling in case quotation return modifies stacks
ws fixes
added notes about bootstrapping and cross-compiling issues
put tokenizer into own file
unit test fixes

- use `tmpdir`
- fix include
- add test for dot existence
fix exception when unknown element type encountered
fix bytecode generation for strings

MFStringLit was not incorporated into bytecode generator after
string representation (by parser) changed to dedicated object.
agenda update, remove phi functions

should not be necessary to insert these
inline words are not automatically non-compilable

E.g. stack shufflers can be converted to a CDFG pretty easily.
clarify scall prim
`-rot` was not inline, fixed
fix unit test for graph generation