Add cp info

docs/command/cp.md

+---
+Title: cp
+---
+```
+at least 2 arguments are needed : src dst
+the command is of the form of (with the strict order of arguments): cp <args> src dst
+where src|dst are local files if prefixed with file:// or file: or grid files otherwise
+after each src,dst can be added comma separated specifiers in the form of: @disk:N,SE1,SE2,!SE3
+where disk selects the number of replicas and the following specifiers add (or remove) storage endpoints from the received list
+args are the following :
+-h : print help
+-f : replace destination file (if destination is local it will be replaced only if integrity check fails)
+-P : enable persist on successful close semantic
+-y <nr_sources> : use up to the number of sources specified in parallel
+-S <aditional TPC streams> : uses num additional parallel streams to do the transfer. (max = 15)
+-chunks <nr chunks> : number of chunks that should be requested in parallel
+-chunksz <bytes> : chunk size (bytes)
+-T <nr_copy_jobs> : number of parralel copy jobs from a set (for recursive copy)
+
+for the recursive copy of directories the following options (of the find command) can be used:
+-select <pattern> : select only these files to be copied; N.B. this is a REGEX applied to full path!!! defaults to all ".*"
+-name <pattern> : select only these files to be copied; N.B. this is a REGEX applied to a directory or file name!!! defaults to all ".*"
+-name <verb>_string : where verb = begin|contain|ends|ext and string is the text selection criteria.
+verbs are aditive : -name begin_myf_contain_run1_ends_bla_ext_root
+N.B. the text to be filtered cannont have underline <_> within!!!
+-parent <parent depth> : in destination use this <parent depth> to add to destination ; defaults to 0
+-a : copy also the hidden files .* (for recursive copy)
+-j <queue_id> : select only the files created by the job with <queue_id>  (for recursive copy)
+-l <count> : copy only <count> nr of files (for recursive copy)
+-o <offset> : skip first <offset> files found in the src directory (for recursive copy)
+```