implemented redownloading recent files of scratchpad
fixed issue for block with 128+ transactions
fixed reconnect issue
Merge remote-tracking branch 'upstream/master'
add xmalloc.c and xmalloc.h from openssh-portable 41c8de2c0031cf59e7cf0c06b5bcfbf4852c1fda
xmalloc.c compiles now
use xmalloc/xasprintf and friends

also fix lp_url allocation, make merkle_count size_t, a couple of paranoid
integer overflow checks, avoid memset of 20000 bytes each time
stratum_request_job is called