download-multi-try now starts with a /bin/bash shebang

Until now, the `download-multi-try' script assumed GNU Bash features (when
comparing the number of attempts at downloading), but it didn't explicitly
ask the operating system to be run with Bash. As a result, when weaker
shells were used (like the default Debian minimalist `dash' shell), the `>'
("larger than" operator in a math context) is interpreted a redirection and
two extra files are created: `1' and `maxcount'!

With this commit, we now start this script with `/bin/bash'. Ofcourse, this
will assume that the host has GNU Bash installed, but we are also making
this assumption in the configure script. So atleast for now, Bash (any
version) is a critical dependency of this template anyway.

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