Release of v0.6.1

This release fixes how files are dynamically downloaded and stored. If the SSW installation is write-protected, any automatically downloaded file is stored in a user-specific folder at /,ssw.

What's Changed

• Fixed wrong URL path to search for new ANC ephemeris files by @FredSchuller in #233
• Use user's local directory if default not writable - addresses issue #234 by @FredSchuller in #236

Full Changelog: v0.6.0...v0.6.1