The new implementation no longer depends on the :type property of the
package, meaning that you can actually `el-get-remove' a package whose type
changed in its recipe.
That cleans up the code and allow not to depend on the :reload property, and
cater with some edge cases like features currently loaded but no longer
present in the updated package.
Conflicts:
el-get.el
Build commands are supposed to be either strings or lists of strings.
But the code for deciding whether to eval the :build property only
checks for a string, not a list. This commit fixes this, so that a
build property whose commands are all lists of strings should no
longer cause an error. Evaluation of the :build property now only
happens when the car is a symbol, since that is the only time that
evaluation would not result in an error.
Also in this commit:
* Ensure build commands are all strings or lists of strings and raise
an error otherwise. The check happens after flattening, so nested
lists of strings should also pass.
* A few syntax fixes
* Add a function "el-get-list-of-strings-p"
This includes teaching methods that they now work with a symbolp PACKAGE,
some more cleaning up, and some load-path adjustments now that a part of the
code is in a subdirectory (methods).
Also include some of the tests used to convince oneself that the refactoring
didn't break any and all use cases for el-get, with some rough documentation
about how to use them.
