Internals:

• Linting
• Avoid asserting config params as strings (fix #89)
• Use a sub-struct for sub-config in Volumes (fix #90)
• Use net/url for targetURL, fix RClone URLs (fix #92)

Configuration:

• Add more volume configuration (fix #91)
• Use a global targetURL (fix #93)

Tests:

• Fix volume tests
• Fix util tests

Documentation:

• Update README
• Improve and update manpage