Add pandaseq/2.8.1, an update of pandaseq/2.7

Signed-off-by: James Oguya <oguyajames@gmail.com>
Add RAxML/8.1.9, an update of RAxML/8.0.23

Signed-off-by: James Oguya <oguyajames@gmail.com>
Add stringtie/0.99, an update of stringtie/0.98

Signed-off-by: James Oguya <oguyajames@gmail.com>