git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4833 c06c8d41-db1a-0410-9941-cceddc491573
IXKNA7JCN2N2NWC6ZMBQWF5BXWPZPLODVS4ACUQQH2ST7X57JB3QC
B7MSPF6X2RLGWN4M6ZZF3WSOPKGYPTTD7LIJVST7DXN27DG6JHNAC
2ESKXYN266CEMLSL6DNCKG4REDO34FXL4ODVGMWDJTNJRKMXWCRQC
A7NKTYZ6VZC42TSSSDEWD5ROPE3P3M5I2QSNAVUMCYJ46PCXTDPQC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
// Choose a deck from inventory and return its slot (or -1.)
// Choose a deck from inventory and return its slot (or -1).