Packaging updates


* configure.ac: change package name, guilesmoduledir
* doc/curl.texi: curl curl -> curl
* src/curl.scm.in: curl curl -> curl
* test/t001_test.test
Update to latest libcurl

* src/const.c: new constants
* src/curl.scm.in: new constants
* src/func.c: new slist type
* src/type.c: new slist type
* src/type.h: new slist type