PKCS#11 patchset 1: fixing an issue with non local objects C_SetAttributeValue and C_CopyObject.
Filter: correction of a bad attributes handling in some error case when C_GetAttributeValue is called on an invalid handle (or fails).
Client lib: corrected a bad node free in the Encrypt/Decrypt linked list handling.
Filter: adding an execute external command handling for versatility in user extensions.
Filter actions: correction of sensitive leak patch helper.
doc: Update documentation on SSL.
client-lib: Add C RPC timeout client override.

This offers a new environment variable in the C client library to override the
default RPC timeout (25 sec). Use "PKCS11PROXY_RPC_TIMEOUT" to configure your
timeout.
doc: Move doc to appropriate section.
Client lib: fixed a GNUTLS ressource deallocation issue when there is an error at init time.
OCaml client: adding support of RPC timeout through the PKCS11PROXY_RPC_TIMEOUT env variable + various getenv failure messages.
client-lib: WIN32 Experimental support for PKCS#11 over RDP.

    Instead of reaching Caml Crush server using UDP or TCP,
    the client library can be configured to use an RDP channel to
    convey RPC calls. This is experimental and only useful for
    WIN32 applications executing within a RDP session.
Merge branch 'ms-rdp' of github.com:ANSSI-FR/caml-crush into ms-rdp