NAME
	write_file - append text to a file

SYNOPSIS
	int write_file(string filename, string text)

DESCRIPTION
	This function appends a given string 'text' to the file 'filename'.

NOTA BENE
	If you need to rewrite a file, that is not append but write from
	start, then you have to first remove the file with rm.

SEE ALSO
	read_file, read_bytes, write_bytes, rm, rmdir