New egg: r7rs-tools

[Diego]

Hi all,

I've made a new egg r7rs-tools that provides r7csc and r7csi, which are roughly 
r7rs-only-by-default versions of csc and csi (essentially, the initial 
environment is only (scheme base) by default, no scheme, (chicken base) or 
(chicken syntax)). The egg has passed test-new-egg, and the release-info url is 
here:

  https://code.dieggsy.com/r7rs-tools/plain/r7rs-tools.release-info

I've not tested this for very large or complicated projects, but it seems to 
work so far for simple examples.

Docs are available here:

  https://wiki.call-cc.org/eggref/5/r7rs-tools

- Diego