Fix: [math] constants.
Fix: [os.fs] obtaining directory contents.
Fix: [os.fs] fs.home() on Unix.
Fix: [os.fs] file copying on Windows.
Fix: [os.fs] a typo.
Fix: [time] DateTime comparison.
Change: math.srand() to seed the process specific random number generator.
Fix: [web.json] typing.
Change: [net] setting SO_EXCLUSIVEADDRUSE by default on Windows.
Change [net] minor interface change.
Add: [os.fs] fs.symlink(), fs.readlink().
Add: conversion to string of fs::Entry and time::DateTime.
Add: [net] net::Socket.name and conversion to string, .peername to .peer.
Fix: overloaded conversion to string.
Add minor changes to the math module.