Fix CTYPE parsing for WCS with SIP distortion extensions#52
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The projection type was extracted from the last 3 characters of CTYPE,
which fails for SIP extensions (e.g., "RA---TAN-SIP" would give "SIP"
instead of "TAN").
Now extracts the projection from the fixed position [5:8] which works
for both standard CTYPE ("RA---TAN") and SIP-extended CTYPE
("RA---TAN-SIP").
Fixes #26
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The projection type was extracted from the last 3 characters of CTYPE, which fails for SIP extensions (e.g., "RA---TAN-SIP" would give "SIP" instead of "TAN").
Now extracts the projection from the fixed position [5:8] which works for both standard CTYPE ("RA---TAN") and SIP-extended CTYPE ("RA---TAN-SIP").
Fixes #26