bigUpload should not store file with uploaded file name in app/cache

[renaudlemaire]

When you upload a learnpath, the file is uploaded with his own filename in app/cache.
If the file is already present, the uploaded file content will be appended and the file will be corrupted or possibly too big.
It's also a problem if users upload the same file at the same time.

chamilo-lms/main/inc/lib/javascript/bigupload/inc/bigUpload.php

Line 48 in 78d9462

if ('learnpath' === $_REQUEST['origin'] && !empty($_REQUEST['name'])) {

[renaudlemaire]

I forgot to talk about the workaround for others users.
Cleaning up the cache and temporary file solves the problem.

[ywarnier]

This issue comes as a result of the fix of another issue (#4429 ) which was that replacing a SCORM package (a feature in the list of learning paths) requires the upload to be done under the same name so that it can effectively be replaced (and not installed as a different SCORM package).
Now because we go through a specific option to "replace" rather than "import for the first time", I guess we could put a flag on it and only overwrite in the cases where we want to replace it (currently we overwrite when we know we are in the learning path tool).
I feel like this issue is relatively minor, so I will move it to bugs to be fixed in 2.0.

[ywarnier]

BigUpload is not used anymore in 2.0.
This should be checked against the option to replace a SCORM but we just realized that this option was not present in C2 yet. Working on this soon.
(hint: lp_update_scorm.php)