increase bottle MEMFILE_MAX value

[mpadge]

See this issue in separate repo for a description. The current implementation is too limited to be of wide practical use because python bottle uses a rather restricted default upper limit for memory buffer (code currently here). This could easily be circumvented by appending the following line to the top of the server.py script:

bottle.BaseRequest.MEMFILE_MAX = <something really big>

Might up the server load a bit, but would make it a lot more useful. Any chance of implementing that?

[Jorl17]

Leaving this here: https://github.com/Jorl17/open-elevation/issues/29#issuecomment-462154786. Thank you and see you in 2 months!