Return meaningful error for meaningless Dockerfiles
fix progressbar in docker push
 Installation for FrugalWare
+ added missing link in index.rst
* some gramatic and spelling fixes

Thx jamtur :)
add REMOTE_TODO
Remove old debug from tarsum
Make sure the cache lookup returns always the same result
Log files name along with their checksum in TarSum + add a Method to retrieve the checksum map
Change BuildFile in order to use TarSum instead of custom checksum
Hash the sums for directory (ureadable when there is too many
Exit with code 1 in case of error for `docker build`
* s/docker/Docker/
Fix typo in working with volumes doc page
Replace FPM --vendor with --license, and give it the proper value of "Apache-2.0"

Fixes #3372
Add DOCKER_HOST env var for client

This env var will set the -H flag on the docker
client.
Reorganize the syntax highlighting files in contrib under a common directory to match "contrib/init" and "contrib/completion"

This is split off from #2970.
add a simple note to suggest to the user to use RUN curl/wget/tool if the URL they need is behind auth
Make blank -H option default to the same as no -H was sent
Fix "docker load" help by removing "SOURCE" prompt and mentioning STDIN

Fixes #3383
fixed header size on narrow desktop window