Paper2v2 updates#2

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rjleveque wants to merge 10 commits intoclawpack:masterfrom

rjleveque:paper2v2_updates

Commits on Nov 24, 2019

update paper2_examples/acoustics_1d_ex1 for v5.6.1, with better plots of solution / levels
rjleveque
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Commits on Dec 21, 2019

update acoustics_1d_ex2 to v5.6.1
rjleveque
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Commits on Dec 23, 2019

fixed incorrect renaming of directories in acoustics_2d_example3
rjleveque
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