* .travis.yml:
* test/travis-ci.sh: Don't treat byte-compilation warnings as errors for
downloaded package.el and ert.
* el-get-dependencies.el (el-get-auto-dependencies): Don't use
`read-from-whole-string', it's obsolete in Emacs 25.
* el-get-list-packages.el (el-get-package-menu-sort-by-column): Don't
assume `mouse-select-window' is fbound, it may not be for non-X builds.
Sometimes there will be multiple packages in the same repository that
depend on each other, so we shouldn't tell el-get to go look for them in
another repository.
Move more variables to el-get-custom.el, add requires or
declare-functions as needed.
There were a few places that appeared to be actual bugs: wrong or
missing variable names.
flet is marked obsolete in 24.3 resulting in quite a lot of annoying
messages. The intended replacement is cl-flet, but that is unavailable
in earlier emacsen, so we can't use that either.
