Merge PR#280 from dirkx/master: --no-prompt flag

Add a --no-prompt flag to pkcs15-tool (i.e. the equivalent of the --no-prompt flag of pkcs15-init). As to aid readers with keypads (as commonly used in the medical space).
Merge PR#288 from philipWendland:upstream-ecc-fix

add the possibility to store public ECC keys encoded according to SPKI
EC pubkey storing: Check if params are available before copying.
pkcs15-lib.c / sc_pkcs15init_store_public_key may be called with keyargs->key.u.ec.params.value == NULL. In this case, allocating and copying the parameters will fail. Add a check to prevent this.