Only use multires zoom calculation to increase zoom (not decrease it) and handle case where minimum HFOV is greater than maximum HFOV (fixes #107).
Only use multires zoom calculation to increase zoom (not decrease it) and handle case where minimum HFOV is greater than maximum HFOV (fixes #107).

mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,mpetroff/pannellum