Compatibility fixes

[JaskaRoman]

Compatibility fixes for issues caused by new IDs and eID Klient versions.

• The SIG_ZEP may be stored as Sig_ZEP
• The label of the certificate (Signing Certificate) no longer matches the key label (Signing Key)
• The eID Klient app defaults to underscored path on current installs.

[harrison314]

@JaskaRoman Why was the use of CKA_LABEL removed from key identification?

[JaskaRoman]

@harrison314 The change was based on my observations of the actual values stored on a newer slovak ID. My theory is, that the original match of the label between the key and the certificate was erroneous and fixed in subsequent revisions. Your original code relied on this behavior. It's my understanding, that the CKA_LABEL check was not crucial, as the surrounding code checks the actual ID. The current CKA_LABEL values are 'Signing key' for the key and 'Signing certificate' for the certificate.

[harrison314]

OK, thanks.