add pyyaml package; also use --ignore-installed with pip for sage so that stuff installed in ~/.local doesn't silently lead to install failure
add pyyaml package; also use --ignore-installed with pip for sage so that stuff installed in ~/.local doesn't silently lead to install failure

tscholl2/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc