Migrated index format to per-release manifests

Also applied the rest of transformations described in alire#227: no top-level
[genera] table, name/version keys, [[depends-on]] array instead of table.

index/he/hello.toml

@@ -1,19 +0,0 @@
-[general]
-description = """"Hello, world!" demonstration project"""
-licenses = []
-maintainers = ["alejandro@mosteo.com"]
-maintainers-logins = ["mosteo"]
-
-['1.0.1']
-origin = "https://github.com/alire-project/hello/archive/v1.0.1.tar.gz"
-origin-hashes = ["sha512:dcc36a2f6f483fab49a73db30247cfd6b53338adb45d728827573a84894456cb65ac29e64d276f38c8c73a7574f871d1d384ef4b9a2c65d3f433501068b95ad9"]
-
-    ['1.0.1'.depends-on]
-    libhello = "^1.0"
-
-['1.0.0']
-origin = "https://github.com/alire-project/hello/archive/v1.0.tar.gz"
-origin-hashes = ["sha512:6f0b4e2cd4fd9c80f88106db6e238ea578f7d0782b98664600cbaaaebe62d0d16c4717a5b5ddf35c9a037dc993845a628b9a940b0c52e4d12c431540f01278d6"]
-
-    ['1.0.0'.depends-on]
-    libhello = "^1.0"

index/he/hello/hello-1.0.0.toml

@@ -0,0 +1,11 @@
+description = "\"Hello, world!\" demonstration project"
+name = "hello"
+version = "1.0.0"
+origin = "https://github.com/alire-project/hello/archive/v1.0.tar.gz"
+licenses = []
+maintainers = ["alejandro@mosteo.com"]
+maintainers-logins = ["mosteo"]
+origin-hashes = ["sha512:6f0b4e2cd4fd9c80f88106db6e238ea578f7d0782b98664600cbaaaebe62d0d16c4717a5b5ddf35c9a037dc993845a628b9a940b0c52e4d12c431540f01278d6"]
+
+[[depends-on]]
+libhello = "^1.0"

index/he/hello/hello-1.0.1.toml

@@ -0,0 +1,11 @@
+description = "\"Hello, world!\" demonstration project"
+name = "hello"
+version = "1.0.1"
+origin = "https://github.com/alire-project/hello/archive/v1.0.1.tar.gz"
+licenses = []
+maintainers = ["alejandro@mosteo.com"]
+maintainers-logins = ["mosteo"]
+origin-hashes = ["sha512:dcc36a2f6f483fab49a73db30247cfd6b53338adb45d728827573a84894456cb65ac29e64d276f38c8c73a7574f871d1d384ef4b9a2c65d3f433501068b95ad9"]
+
+[[depends-on]]
+libhello = "^1.0"