Load open files (read) from cloud

[paulrho]

No description provided.

[paulrho]

Allow OPEN of files that are on the cloud.
Read implemented first.
Perhaps the whole file should be read into memory or onto disk first.

[paulrho]

A possible implementation:
flag on "cloud/web" version is_remote_open
very first step on OPEN is to read to local file (put .cache suffix on it)
all ops on local file
as the CLOSE (including program shutdown (maybe even program break) -
for write, save whole cache file to remote file.