Correct auto-load order:
The previous order was to search the default PKI before EASYRSA.
Change: EASYRSA is moved to a higher priority than a default PKI.
Remove 'program location' as a valid target for auto-loading vars.
Keeping writable data files in the same folder as executable code
is not necessary. If it is required then use of other options is
preferred. eg: --vars=<FILE> or $EASYRSA
Add additional information regarding use of default PKI.
Add section to advise the preferred use of --pki over --vars.
Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>