The proxy is now in the project folder
Fixed changeDirectory and deleteFile

changeDirectory threw an exception if the destination was the root
folder.
deleteFile is now working properly on files in root and subfolders.
Deleted PHPSQL_PROXY Constant
Added push&delete proxy

The proxy file gets now uploaded to the server on program start and
deleted on program closing.
Added LOCAL_PROXY_FILE and REMOTE_PROXY_FILE

They contain the position of the proxy file on the machine and on the
server