Bug 275744: In client hello, list compression methods in the order of desirability so that servers that simply pick the first mutually supported compression method will pick the best compression method. Add compression method info to the SSLChannelInfo structure. Rename SSL3CompressionMethod to SSLCompressionMethod and add the ssl_ prefix to the enum constants. Remove an extra comma in strsclnt.c that breaks the concatenation of two string literals. r=agl,rrelyea,nelson.