Minor: InchCoord's initWithNSNumber: shortened to 1 line

• InchCoord's initWithNSNumber:, which piggy-backs off of initWithDouble:, shortened to return initWithDouble:'s return directly, shortening it to one line and a full piggy-back (and thus, validated in not setting nor checking self itself).
• Opening curly brace bumped up to the same line as the method name.