Modular structure. Updated documentation

docs/make.jl

 using Documenter, BDIO
 
-makedocs(modules=[BDIO], doctest=true)
+makedocs(modules=[BDIO], doctest=true, sitename = "BDIO meets Julia")
 
 deploydocs(deps   = Deps.pip("mkdocs", "python-markdown-math"),
            repo = "github.com/GITHUBNAME/GITHUBREPO.git",

docs/src/index.md

 # BDIO in Julia
 
 This package provides an interface to read/write
-[BDIO](http://bdio.org/) files in Julia.
+[BDIO](http://bdio.org/) (**B**inary **D**ata **I**nput/**O**utput)
+files in Julia. 
+
+## Index
+
+```@index
+```
 
 ## Externally callable functions
 
+### Setting up global information
+
+```@docs
+BDIO.BDIO_set_user
+BDIO.BDIO_set_host
+```
+
 ### Openning `BDIO` files
 
 ```@docs
@@ -34,7 +47,3 @@ BDIO.BDIO_get_len
 BDIO.BDIO_get_fmt
 ```
 
-## Index
-
-```@index
-```

src/BDIOtypes.jl

+mutable struct Record
+    ishdr::Bool
+    islong::Bool
+
+    # Record length, start, end
+    rlen::Int64 
+    rpos::Int64
+    rend::Int64
+
+    rfmt::Int32
+    ruinfo::Int8
+
+    hsh::Nettle.Hasher    
+end
+
+mutable struct BDIOstream
+    io::IO
+    ipt::Int64
+    
+    imode::Int32
+    istate::Int32
+    rwpos::Int64
+    
+    lendian::Bool
+
+    user::String
+    host::String
+    created::Int32
+    modified::Int32
+    info::String
+
+    rdate::Int64
+    
+    records::Array{Record,1}
+end
+

src/BDIOvalues.jl

+
+const BDIO_R_MODE    = 0
+const BDIO_W_MODE    = 1
+const BDIO_A_MODE    = 2
+const BDIO_D_MODE    = 3
+const MAXFNAME       = 4096
+const BDIO_SHORT_LEN = 256
+const BDIO_LONG_LEN  = 4096
+const BDIO_MAGIC     = 2147209342
+const BDIO_VERSION   = 1
+const BDIO_R_STATE   = 0
+const BDIO_W_STATE   = 1
+
+
+const BDIO_BIN_GENERIC =   0
+const BDIO_ASC_EXEC    =   1
+const BDIO_BIN_INT32BE =   2
+const BDIO_BIN_INT32LE =   3
+const BDIO_BIN_INT64BE =   4
+const BDIO_BIN_INT64LE =   5
+const BDIO_BIN_F32BE   =   6
+const BDIO_BIN_F32LE   =   7
+const BDIO_BIN_F64BE   =   8
+const BDIO_BIN_F64LE   =   9
+const BDIO_ASC_GENERIC =  10
+const BDIO_ASC_XML     =  11
+const BDIO_BIN_INT32   = 240
+const BDIO_BIN_INT64   = 241
+const BDIO_BIN_F32     = 242
+const BDIO_BIN_F64     = 243
+
+const BDIO_HASH_MAGIC_S = 1515784845
+
+user = "                                                                                                                                                                                                                                                               "
+host = "                                                                                                                                                                                                                                                               "
+