Update MASS startup docs

[joefowler]

Original report by Joseph Fowler (Bitbucket: joe_fowler, ).

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1. Add a markdown file explaining some standard TES exploratory analysis, with examples of “stuff users might want to plot”
2. Move/copy the LJH 2.2 file format documentation from the group wiki to mass/doc
3. Check the existing demo package. Does it still work, more or less? If so, fix it. If not, remove it.

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[joefowler]

Original comment by Joseph Fowler (Bitbucket: joe_fowler, ).

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This is at the request of @{63c959f69d59ec705fecefd1} and @{62ab6ad5a80881006f63bef7} .

[joefowler]

Original comment by Joseph Fowler (Bitbucket: joe_fowler, ).

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Issue #232 was marked as a duplicate of this issue.

[joefowler]

Original comment by Joseph Fowler (Bitbucket: joe_fowler, ).

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Removing milestone: v0.7 (automated comment)

[joefowler]

Original comment by Joseph Fowler (Bitbucket: joe_fowler, ).

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Item 2 (LJH docs) is resolved in commit 23d95645.